Design and application of multi-section bundled bag wire-line coring drilling tools

Authors

HAN Yi, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
ZHANG Shaohe, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, ChinaFollow
BAI Rui, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
SUN Pinghe, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
SHU Biao, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
CAO Han, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
ZHANG Xinxin, Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China; School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Abstract

Because the existing conventional wire-line coring drilling tool lacks the water-proof and core-protecting device, the broken core is easily eroded when the core is drilled in a complicated layer such as loose, weak, broken layers and the core is easy to fall off during the lifting process, so that the coring rate and core quality are not up to the design requirements, and even core can not be taken to. In response to the above problems, a bag-type wire-line coring drilling tool was designed. The drill adds a multi-section bundled bag assembly structure to the conventional wire-line coring drilling tool is used in conjunction with the front side spray bit. The bag can isolate the rinsing liquid, which is beneficial to obtain the undisturbed core. By segmenting the bundle, the core can be effectively wrapped to prevent it from falling off during the drilling process. The front side spray bit changes the flow direction of the rinsing liquid and acts as a water barrier and a protector of core. The field application shows that the drilling tool can complete the drilling work in complex layers such as loose, weak and broken layers. The coring rate is over 90%, and the core quality is also obviously improved.

Keywords

coring drilling tools, bag-type, complex formation, wire-line coring, the front side spray bit

DOI

10.3969/j.issn.1001-1986.2019.05.031

Recommended Citation

HAN Yi, ZHANG Shaohe, BAI Rui, et al. (2019) "Design and application of multi-section bundled bag wire-line coring drilling tools," Coal Geology & Exploration: Vol. 47: Iss. 5, Article 32.
DOI: 10.3969/j.issn.1001-1986.2019.05.031
Available at: https://cge.researchcommons.org/journal/vol47/iss5/32

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